varobj.c cleanup

[Vladimir Prus]

I've checked in the below varobj.c cleanup; no behaviour change.

- Volodya

2008-03-26  Vladimir Prus  <vladimir@codesourcery.com>

	* varobj.c (struct varobj_root): Rename use_selected_frame to
	floating, and clarify the meaning.
	(varobj_create, varobj_update,  new_root_variable): Adjust.
	(value_of_root): Don't use type_changed as in variable,
	adjust comment.
	(c_value_of_root): Adjust.
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